Born with great Force potential, Hethrir and his lover Rillao trained with the Dark Lord of the Sith Darth Vader. It soon became apparent to the Dark Lord that Hethrir would indeed be a great Dark Jedi, but Rillao would soon turn to the Light Side. When news came out that she was to have a child, Vader had high hopes for turning the son of Hethrir to the Dark Side. But Rillao fled with her unborn child to a planet far, far away. She needed to hide them from Hethrir and the Dark Side.
The child was conceived, and turned out to be a boy, whom Rillao named Tigris. Although he was the son of two Force users, Tigris himself had no Force abilities at all. Rillao also never told him about his heritage, and Tigris still di not know even when Hethrir found them and kidnapped his son. Rillao was improsoned aboard a dead freighter, and Tigris became a slave to the man who he did not know was his father.
This all led to Hethrir's elevation to the position of Procurator of Justice, one of Vader's Dark Side agents. This meant that Hethrir would have to prove his loyalty to the Empire, and he did so in a horrendous way. He first abducted a freighter, which was transporting many of his people. He then proceeded to obliterate Firrerre, his home planet, killing millions of Firrerreons in the destruction.
Having accomplished these attrocities, Hethrir became of one the greatest enemies og the galaxy, and when the Empire fell, he realised that he had to disappear. He gathered his followers and resources, and moved to a small planet of his very own. It was a completely technological construct, given the name 'worldcraft'. It had been a gift from the Emperor, who handed them out to agents who had performed great feats of evil. From the 'worldcraft', Hethrir planned to make an 'Empire reborn', with himself as its leader. But in order to do so, he had to get greater access to the Force. There was a way of doing so: through a being called Waru.
Waru was a fleshy mass covered in gold scales. It lived aboard Crseih Resaerch Station, and acted as a faith healer. What he actually did was take the life force from some of the beings who came to him, and used it to open a portal to the Force. The aim was to be able to use the portal to go home, but he would a being with exceptional power in the Force to do so. Hethrir knew this, and had been kidnapping children throughout the galaxy, enslaving the non-Force users, and making students out of the oes with potential.
All the while he searched for that one special child, and when he came across the Jedi sons children of Han and Leia, he though he had found the perfect candidate in the form of Vader's grandson, Anakin. He kidnapped all three, and placed Jacen and Jaina in his Dark Side training ventre. Meanwhile he left to deliver Anakin to Waru. His plan was foiled when Rillao came back from what Hethrir thiught must have been the dead. Desperate to get her children back, Leia had found and freed Rillao, and now the former lover of Hethrir wanted revenge. She told Tigris of his true heritage, who then helped Anakin to escape. Without the Force-strong child, Hethrir's plans could not be realised, and Waru perished. As he died, he dragged Hethrir with him, destroying them both in the energy field.
Hethrir would have learned an important lesson that day, if he had lived: the Dark Side hath no fury like a woman scorned.